perf: optimize dashboard refresh from >500ms to ~140ms#8
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Rewrite getToolUsageSummary() from N×5 dynamic queries to single prepared CTE query. Collapse getTokenSummary() from 4 queries to 1. Remove date() function wrapping in WHERE clauses to enable index usage. Add 2s TTL cache on /api/stats route. Move maintenance off request path to background timers. Add mmap_size/cache_size pragmas and idx_sessions_last_seen index.
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Summary
getToolUsageSummary()from N×5 dynamic queries with string interpolation to a single prepared CTE query (P0, ~60-80% of latency)getTokenSummary()from 4 separate full-table scans to 1 query with conditional aggregation (P1)date()function wrapping in WHERE clauses to enable index usage onidx_messages_timestamp/idx_tool_calls_timestamp(P1)/api/statsroute to skip redundant DB queries within refresh cycles (P2)maybeAggregate()/maybeGC()from request path to backgroundsetIntervaltimers (P2)mmap_size(256MB) andcache_size(8MB) SQLite pragmas for read performance (P2)idx_sessions_last_seenindex via new migration v2 (P3)getTodayTokensstatement in constructor for consistencyTest coverage
Measured result
Dashboard auto-refresh latency reduced from >500ms (yellow) to ~140ms (green).